When to start dahlias for cuttings

Hello. I grew a load of dahlias last year and started them indoors to coincide with the end of the frosts so they could get out ASAP. This year i would like to start them off earlier so that i can get cuttings and hopefully get the cuttings flowering this summer. I will be doing this in a cold but frost free conservatory. I am ordering from Peter Nyssen and would like to know what delivery date to put on the order. I am in the central belt of scotland. Cheers

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I bought mine new last spring and potted them up in the polytunnel. This would have been March. Even with the warmer temps we have here it took a while before they produced shoots so you'll need considerable warmth to get them going early in central Scotland.

Thanks for the comments. I think i will set up a few experiments with the ones i didnt like so much. Start one off at end of jan in warm room, one in conservatory. If i lose them it's no great loss but if they do well i'll have a plan for next year